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DENOMINATOR DEFINITION:

Prescription drug utilization and spending rates use a 40% Medicare random-sample denominator file for each year from 2006 to 2010. For the 2010 Part D enrollment cohort, patients were included if they (1) were age 65 or older as of 1/1/2010, (2) were alive and continuously enrolled in a stand-alone Medicare Part D plan for all 12 months of 2010, and (3) were not enrolled in hospice or a managed Medicare plan (Medicare Advantage) at any time during 2010.

NUMERATOR DEFINITION:

Total non-prescription (Parts A and B) spending was also calculated from inpatient and outpatient claims records.

The Dartmouth Atlas of Health Care is based at The Dartmouth Institute for Health
Policy and Clinical Practice and is supported by a coalition of funders led by the Robert Wood Johnson Foundation,
including the WellPoint Foundation, the United Health Foundation, the California HealthCare Foundation, and the Charles H. Hood Foundation.